Continuity mistake: When the Grinch tries to stuff the tree up the chimney, an ornament falls off the tree and rolls over to Cindy Lou Who's bed. Then, when the Grinch turns around to see Cindy Lou Who holding the ornament, it has grown tremendously in size.
Other mistake: After the Grinch sends Cindy Lou Who to bed and closes the door, part of his Santa suit becomes the same colour as the background mid-shot.
Other mistake: When the Grinch rides his sleigh back to Whoville and returns everything, as the narrator says, "He brought back their pantookas," a pink ornament lands on the Christmas tree, then changes to yellow mid-shot.
Other mistake: When the Grinch runs to the top of Mount Crumpit and grabs the sleigh, a part of the sleigh disappears for a frame or two.
